JPH08325385A - Carbon-fiber reinforced thermoplastic resin molding and its production - Google Patents
Carbon-fiber reinforced thermoplastic resin molding and its productionInfo
- Publication number
- JPH08325385A JPH08325385A JP13512295A JP13512295A JPH08325385A JP H08325385 A JPH08325385 A JP H08325385A JP 13512295 A JP13512295 A JP 13512295A JP 13512295 A JP13512295 A JP 13512295A JP H08325385 A JPH08325385 A JP H08325385A
- Authority
- JP
- Japan
- Prior art keywords
- thermoplastic resin
- carbon fiber
- fiber reinforced
- pellets
- reinforced thermoplastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Reinforced Plastic Materials (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電磁シールド体とし
て、また、パーソナルコンピュータ、ワードプロセッサ
等の各種電子・電気機器の筐体として有用なＣＦＲＴＰ
（炭素繊維強化熱可塑性樹脂：Carbon Fiber Reinforce
d Thermoplastics）成形品およびその製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is useful as an electromagnetic shield and as a casing for various electronic and electric devices such as personal computers and word processors.
(Carbon Fiber Reinforce: Carbon Fiber Reinforce
d Thermoplastics) molded article and its manufacturing method.
【０００２】[0002]
【従来の技術】電子・電気機器の筐体には、炭素繊維で
強化された熱可塑性樹脂からなる炭素繊維強化熱可塑性
樹脂成形品（以下単にＣＦＲＴＰ成形品という）が多く
使われている。このようなＣＦＲＴＰ成形品はほとんど
炭素繊維と熱可塑性樹脂との混練物を射出成形すること
によって作られているが、混練時等でほとんどの炭素繊
維が０．３mm以下に折れてしまうので、成形品の剛性や
強度の力学特性が低くなり、薄肉化、軽量化が難しい問
題がある。また、炭素繊維が短く折れるのに伴い、筐体
として必要な電磁シールド特性も低下する。電磁シール
ド特性を補うために、表面に金属メッキを施すことも行
われているが、工程数が増え、製造コストが高くなる。2. Description of the Related Art A carbon fiber reinforced thermoplastic resin molded product (hereinafter simply referred to as a CFRTP molded product) made of a thermoplastic resin reinforced with carbon fiber is often used for a housing of electronic / electrical equipment. Most of such CFRTP molded products are made by injection molding a kneaded product of carbon fibers and a thermoplastic resin. However, most of the carbon fibers will break to 0.3 mm or less when kneading, so molding There is a problem that the mechanical properties of the product such as rigidity and strength are lowered, and it is difficult to reduce the thickness and weight. Further, as the carbon fiber is broken shortly, the electromagnetic shield characteristics required for the housing also deteriorate. Although metal plating is applied to the surface to supplement the electromagnetic shield characteristics, the number of steps is increased and the manufacturing cost is increased.
【０００３】また、特開平６−３２２１４４号公報に
は、例えば、長さが６mm以上の炭素繊維を含み、炭素繊
維単糸間まで樹脂が含浸したペレットを射出圧縮成形す
ることにより得られる、長さ１mm以上の炭素繊維を３重
量％以上含有するＣＦＲＴＰ成形品が記載されている。
本方法による成形品は上記一般的な射出成形品に比し
て、成形品中に残存する繊維長が長くなり、電磁シ−ル
ド特性が向上する方向に改善されるものの、その効果は
少ない。Further, Japanese Patent Laid-Open No. 6-322144 discloses, for example, a carbon fiber having a length of 6 mm or more, which is obtained by injection compression molding a pellet impregnated with a resin between carbon fiber single yarns. A CFRTP molded article containing 3% by weight or more of carbon fiber having a length of 1 mm or more is described.
The molded product produced by the present method has a longer fiber length remaining in the molded product and is improved in the electromagnetic shield characteristics as compared with the above-mentioned general injection molded product, but its effect is small.
【０００４】そこで、特公平５−５８３７１号公報に
は、繊維長が１０〜１００mmの炭素繊維と熱硬化性樹脂
との複合体からなる成形品が記載されている。この成形
品は、炭素繊維の繊維長が長いので、電磁シ−ルド特性
は高い。しかし、所望の成形品の形状のキャビティを有
する金型内で、炭素繊維を含む熱硬化性樹脂を硬化させ
るのに、少なくとも３分以上、通常は１０分以上かか
り、成形サイクルが長いために製造コストが高くなるば
かりか、熱硬化性樹脂を使用しているので、成形品のリ
サイクルが難しい。Therefore, Japanese Patent Publication No. 5-58371 discloses a molded article composed of a composite of carbon fiber having a fiber length of 10 to 100 mm and a thermosetting resin. Since this molded product has a long carbon fiber length, it has high electromagnetic shield characteristics. However, it takes at least 3 minutes or more, usually 10 minutes or more to cure the thermosetting resin containing the carbon fiber in the mold having the cavity having the shape of the desired molded product. Not only is the cost high, but because a thermosetting resin is used, it is difficult to recycle the molded product.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、以上
のような問題点を解決し、厚みが薄くても強度や剛性、
電磁シールド特性に優れたＣＦＲＴＰ成形品を低コスト
で提供せんとするものである。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to achieve strength and rigidity even if the thickness is thin,
The objective is to provide CFRTP molded products with excellent electromagnetic shielding properties at low cost.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、この発明のＣＦＲＴＰ成形品は、熱可塑性樹脂と、
重量平均繊維長が０．３mm以上の炭素繊維とを繊維含有
率が２０〜６０重量％になるように複合してなる、板状
部を有する成形品であって、板状部は、厚みが０．５〜
２．０mmの範囲にあり、かつ、電気抵抗が２Ω／cm以下
であることを特徴とする。In order to achieve the above object, the CFRTP molded article of the present invention comprises a thermoplastic resin,
A molded article having a plate-shaped portion, which is formed by combining carbon fibers having a weight average fiber length of 0.3 mm or more so that the fiber content is 20 to 60% by weight, and the plate-shaped portion has a thickness of 0.5 ~
It is characterized by being in the range of 2.0 mm and having an electric resistance of 2 Ω / cm or less.
【０００７】また、上記ＣＦＲＴＰ成形品において、板
状部の曲げ強度は１５kgf/mm2 以上で、曲げ弾性率は
１，２００kgf/mm2 以上であるのが好ましい。さらに、
熱可塑性樹脂は、ポリフェニレンスルフィド（ＰＰＳ）
であることが好ましい。[0007] In the above CFRTP molded article, flexural strength of the plate-like portion is 15 kgf / mm 2 or more, the flexural modulus is preferably at 1,200kgf / mm 2 or more. further,
Thermoplastic resin is polyphenylene sulfide (PPS)
It is preferred that
【０００８】また、この発明におけるＣＦＲＴＰ成形品
の製造方法は、熱可塑性樹脂と、長さが２〜２０mmの範
囲にある炭素繊維とを繊維含有率が２０〜６０重量％に
なるように複合してなるペレットを用い、このペレット
を圧縮比が１．２〜１．９の範囲にある射出成形機を用
いて溶融、混練しながら、所望の形状をしたキャビティ
を有する金型に射出成形することを特徴とする。Further, in the method for producing a CFRTP molded article according to the present invention, a thermoplastic resin and carbon fibers having a length of 2 to 20 mm are compounded so that the fiber content is 20 to 60% by weight. Injection molding into a mold having a cavity having a desired shape while melting and kneading the resulting pellets using an injection molding machine having a compression ratio of 1.2 to 1.9. Is characterized by.
【０００９】さらに、別の製造方法は、長さが２〜２０
mmの範囲にある炭素繊維束に、重量比率がその炭素繊維
の０．６〜４倍の範囲になるように熱可塑性樹脂を被覆
したペレットを用い、そのペレットを射出成形機で溶
融、混練しながら、所望の形状をしたキャビティを有す
る金型に射出成形することを特徴とする。Further, another manufacturing method has a length of 2 to 20.
Use pellets coated with thermoplastic resin in a carbon fiber bundle in the range of mm so that the weight ratio is in the range of 0.6 to 4 times that of the carbon fibers, and melt and knead the pellets with an injection molding machine. However, it is characterized in that it is injection-molded into a mold having a cavity having a desired shape.
【００１０】以下この発明をさらに詳細に説明するに、
炭素繊維は、引張り強度が２００kgf/mm2 以上で、引張
り弾性率が１５，０００kgf/mm2 以上である高強度、高
弾性率炭素繊維からなるものであるのが好ましい。強化
繊維の力学物性が低いとその繊維で強化されたＣＦＲＴ
Ｐの力学物性も低下する。The present invention will be described in more detail below.
Carbon fibers, a tensile strength of 200 kgf / mm 2 or more, high strength tensile elastic modulus is 15,000kgf / mm 2 or more, and preferably made of high modulus carbon fiber. CFRT reinforced with reinforced fiber when its mechanical properties are low
The mechanical properties of P also deteriorate.
【００１１】熱可塑性樹脂としては、ポリアミド（ナイ
ロン６、ナイロン６６等）、ポリオレフィン（ポリエチ
レン、ポリプロピレン等）、ＰＰＳ、ポリエチレンテレ
フタレート、ポリブチレンテレフタレート、ポリカーボ
ネート、ポリスチレン、ＡＢＳや、アクリロニトリルと
スチレンの共重合体等、あるいは、これらの混合物を用
いることができる。中でもＰＰＳが好ましい。ＰＰＳは
筐体に必要な不燃性に優れ、かつ、薄肉成形に必要な流
動性が高いからである。他の熱可塑性樹脂においても、
水酸化アルミニウム、三酸化アンチモン、臭素化合物等
の難燃剤を配合すれば、不燃性を向上させることができ
る。Examples of the thermoplastic resin include polyamide (nylon 6, nylon 66, etc.), polyolefin (polyethylene, polypropylene, etc.), PPS, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polystyrene, ABS, and acrylonitrile / styrene copolymers. Etc., or a mixture thereof can be used. Of these, PPS is preferable. This is because PPS has excellent incombustibility required for a housing and high fluidity required for thin-wall molding. In other thermoplastics,
Incombustibility can be improved by adding a flame retardant such as aluminum hydroxide, antimony trioxide, or a bromine compound.
【００１２】炭素繊維は、熱可塑性樹脂との複合体中に
２０〜６０重量％の範囲で含まれている。２０重量％よ
り低いと、成形品の強度や剛性が不足することがある。
また、電磁シールド特性も低くなる。６０重量％を越え
ると、成形時の流動性が低下し、金型内キャビティに、
材料が充填しないことがある。The carbon fiber is contained in the composite with the thermoplastic resin in the range of 20 to 60% by weight. If it is less than 20% by weight, the strength and rigidity of the molded product may be insufficient.
In addition, the electromagnetic shield characteristic is also reduced. If it exceeds 60% by weight, the fluidity at the time of molding will decrease, and
Material may not fill.
【００１３】射出成形に用いるペレットは、炭素繊維ト
ウに所望量の熱可塑性樹脂を付着、含浸せしめ、２〜２
０mmの所望長さにカットして得られる、いわゆる長繊維
ペレットを用いることができる。２mmより短いと、成形
品中の炭素繊維長さも短くなり、強度や剛性、電磁シー
ルド特性が低くなる。２０mmより長いと、ペレットの多
きさが大きくなり、射出成形する際に、ホッパーからス
クリューへの材料噛み込み不良の原因となる。The pellets used for injection molding are prepared by adhering and impregnating a desired amount of a thermoplastic resin to a carbon fiber tow, and then by applying 2 to 2
So-called long fiber pellets obtained by cutting to a desired length of 0 mm can be used. If the length is shorter than 2 mm, the length of carbon fiber in the molded product will be shortened, and the strength, rigidity and electromagnetic shield characteristics will be deteriorated. If it is longer than 20 mm, the amount of pellets becomes large, which may cause defective material biting from the hopper into the screw during injection molding.
【００１４】本発明の射出成形時に用いる射出成形機の
スクリュー部を図１に示す。スクリュー１は供給ゾーン
Ａ、圧縮ゾーンＢ、計量ゾーンＣで構成され、圧縮比は
供給ゾーンＡの溝深さｈA と、計量ゾーンＣの溝深さｈ
C の比ｈA ／ｈC で表わされる。ペレット２は、ホッパ
ー３から供給され、スクリューの回転によって、供給ゾ
ーンＡから圧縮ゾーンＢ、計量ゾーンＣへと送られる。
またシリンダ４は、用いる熱可塑性樹脂の融点以上に加
熱されており、材料がシリンダ４内を移動するのに伴
い、スクリューの溝が浅くなることによって溶融、混練
されることになる。FIG. 1 shows a screw portion of an injection molding machine used in the injection molding of the present invention. The screw 1 is composed of a supply zone A, a compression zone B, and a measuring zone C, and the compression ratio is a groove depth h A of the supply zone A and a groove depth h of the measuring zone C.
It is represented by the ratio of C h A / h C. The pellets 2 are supplied from the hopper 3 and sent from the supply zone A to the compression zone B and the weighing zone C by the rotation of the screw.
Further, the cylinder 4 is heated to a temperature higher than the melting point of the thermoplastic resin used, and as the material moves in the cylinder 4, the groove of the screw becomes shallow, so that it is melted and kneaded.
【００１５】通常の射出成形では、材料の混練性を得る
ために、圧縮比２以上の射出成形機が用いられる。しか
しながら、長さ２mm以上の炭素繊維を含み、一本一本の
単糸間まで熱可塑性樹脂が含浸したペレットを材料とし
て、圧縮比２以上の射出成形機で成形すると、ペレット
がスクリューで混練される際に、炭素繊維が短く折れ、
強度や剛性、特に電磁シールド特性が低くなる問題があ
る。圧縮比２以下の射出成形機で成形すると、材料の混
練性が不足する可能性があるが、本発明の成形品は厚み
が２mm以下の薄肉成形であり、流動幅の狭いキャビティ
を通過する際にも材料の混練作用があり、表面性、強化
繊維の分散性、力学特性等、優れた成形品を得ることが
できる。ただし、圧縮比を１．２より小さくすると、材
料の十分な混練性が得られなくなる。In ordinary injection molding, an injection molding machine having a compression ratio of 2 or more is used in order to obtain the kneading properties of materials. However, when pellets containing carbon fibers with a length of 2 mm or more and having a thermoplastic resin impregnated between individual single yarns are used as a material and molded with an injection molding machine with a compression ratio of 2 or more, the pellets are kneaded with a screw. Carbon fiber breaks shortly when
There is a problem that strength and rigidity, especially electromagnetic shielding characteristics are deteriorated. When molding with an injection molding machine with a compression ratio of 2 or less, the kneading properties of the material may be insufficient, but the molded product of the present invention is a thin molding with a thickness of 2 mm or less, and when passing through a cavity with a narrow flow width. Also, there is a kneading action of the material, and it is possible to obtain a molded product having excellent surface properties, dispersibility of reinforcing fibers, mechanical properties and the like. However, if the compression ratio is less than 1.2, sufficient kneadability of the material cannot be obtained.
【００１６】本発明の他の製造方法においては、長さが
２〜２０mmの範囲にある炭素繊維束に、重量比率がその
炭素繊維の０．６〜４倍の範囲になるように熱可塑性樹
脂を被覆したペレットを用いて射出成形する。この場
合、射出成形機圧縮比の範囲に特に制限はないが、好ま
しくは１．２〜３、より好ましくは１．２〜１．９であ
る。In another manufacturing method of the present invention, a thermoplastic resin is used so that the weight ratio of carbon fiber bundles having a length of 2 to 20 mm is 0.6 to 4 times that of the carbon fibers. Injection molding using the pellets coated with. In this case, the compression ratio of the injection molding machine is not particularly limited, but it is preferably 1.2 to 3, and more preferably 1.2 to 1.9.
【００１７】上述のごとく、炭素繊維一本一本の単糸間
まで熱可塑性樹脂が含浸したペレットを材料として、圧
縮比２以上の射出成形機で成形すると、炭素繊維が短く
折れるばかりでなく、熱可塑性樹脂は溶融粘度が高く、
ペレット製造のために高価な設備と時間を必要とし、材
料コストが高くなる。炭素繊維束の周囲に熱可塑性樹脂
を被覆したペレットにおいては、スクリュー部を通過す
る際に、単糸間に熱可塑性樹脂が含浸されないまま、つ
まりドライの繊維束の状態で通過する距離が長くなり、
繊維が折れにくくなる。この場合、成形品中に熱可塑性
樹脂が含浸していない部分が発生する懸念があるが、本
発明の成形品は厚みが２mm以下の薄肉成形であり、上述
のごとく、流動幅の狭いキャビティを通過する際にも材
料の混練作用があり、その問題はない。As described above, when the pellets in which the thermoplastic resin is impregnated between the individual carbon fibers are used as a material and the pellets are molded by an injection molding machine with a compression ratio of 2 or more, not only the carbon fibers are shortly broken but also Thermoplastic resins have high melt viscosity,
Pellet production requires expensive equipment and time, resulting in high material costs. In the pellets coated with thermoplastic resin around the carbon fiber bundle, when passing through the screw part, the thermoplastic resin is not impregnated between the single yarns, that is, the distance of passage in the dry fiber bundle state becomes longer. ,
The fibers are hard to break. In this case, there is a concern that a portion not impregnated with the thermoplastic resin may occur in the molded product, but the molded product of the present invention is thin-walled molding having a thickness of 2 mm or less, and as described above, a cavity having a narrow flow width is formed. There is no problem with the kneading action of the materials when they pass.
【００１８】長さが２mm以上の炭素繊維束の周囲に熱可
塑性樹脂を被覆したペレットは、電線被覆工程のよう
に、炭素繊維トウを押出し型に通し、炭素繊維トウの周
囲に熱可塑性樹脂を被覆しながら引取った後、所望の長
さにカットして製造することができる。本製造工程は、
安価な設備で引取り速度を速くでき、ペレットの製造コ
ストを安くすることができる。The pellet in which the thermoplastic resin is coated around the carbon fiber bundle having a length of 2 mm or more is passed through the extrusion die of the carbon fiber tow as in the electric wire coating step, and the thermoplastic resin is applied around the carbon fiber tow. It can be manufactured by taking it off while covering and then cutting it to a desired length. This manufacturing process is
The take-up speed can be increased with inexpensive equipment, and the pellet manufacturing cost can be reduced.
【００１９】上述したペレットを材料として、上述した
製造方法を用いることによって、成形品中の重量平均繊
維長が０．３mm以上あり、厚みが０．５〜２mmの範囲に
あり、かつ、板状部の任意の２点間の電気抵抗を２Ω／
cm以下にすることができる。この値は、測定した電気抵
抗をその距離で除した値である。重量平均繊維長が０．
３mmより短くなったり、厚みが０．５mmより薄くなる
と、強度、剛性、電磁シールド性が不足する。厚みが２
mmを越えると、強度、剛性は向上するが、重量が増加す
る問題がある。By using the above-mentioned pellets as a material and using the above-mentioned manufacturing method, the weight average fiber length in the molded product is 0.3 mm or more, the thickness is in the range of 0.5 to 2 mm, and the plate-like shape is obtained. Electrical resistance between any two points of the part is 2Ω /
Can be less than or equal to cm. This value is the measured electrical resistance divided by the distance. Weight average fiber length is 0.
If the length is shorter than 3 mm or the thickness is thinner than 0.5 mm, the strength, rigidity and electromagnetic shielding property will be insufficient. Thickness is 2
If it exceeds mm, the strength and rigidity are improved, but the weight is increased.
【００２０】成形品の板状部５の例を図２に示す。板状
部５は、成形品のどのエッジからも１０mm以上離れた部
分とする。エッジの部分は正確な電気抵抗を測定できな
いことがあるからである。したがって、成形品に開口部
６があれば、その周囲１０mmは含まないことになる。電
気抵抗は、測定点２か所に直径４mmの穴をあけ、Ｍ４の
スチール製ボルト７にナットを締め付けて端子とし、テ
スターで測定する。電気抵抗が２Ω／cmより大きくなる
と、電磁シールド性が不足することになる。An example of the plate-shaped portion 5 of the molded product is shown in FIG. The plate-like portion 5 is a portion separated by 10 mm or more from any edge of the molded product. This is because accurate electrical resistance may not be measured at the edge portion. Therefore, if the molded product has the opening 6, the periphery 10 mm is not included. The electric resistance is measured with a tester by making holes with a diameter of 4 mm at two measurement points, tightening nuts on M4 steel bolts 7 to form terminals. If the electric resistance is higher than 2 Ω / cm, the electromagnetic shielding property will be insufficient.
【００２１】本発明におけるＣＦＲＴＰ成形品の具体例
として、例えば、ノート型パソコンの筐体、キーボード
支持体、携帯用電話機筐体、ヘツドフォンステレオキャ
ビネット、またはラジカセキャビネット等の電子・電気
機器用筐体が挙げられる。As a concrete example of the CFRTP molded product in the present invention, for example, a casing of a notebook computer, a keyboard support, a casing of a portable telephone, a headphone stereo cabinet, a casing for electronic equipment such as a radio-cassette cabinet, etc. Is mentioned.
【００２２】[0022]
実施例１ 炭素繊維（引張強度３６０kgf／mm2 、引張弾性率２
３，５００kgf／mm2 、単糸数１２，０００本）に、Ｐ
ＰＳを含浸後、長さ７mmにカットして、炭素繊維の含有
率が３０重量％のペレットを得た。Example 1 Carbon fiber (tensile strength 360 kgf / mm 2 , tensile modulus 2
3,500 kgf / mm 2 , single yarn count 12,000), P
After impregnated with PS, it was cut into a length of 7 mm to obtain pellets having a carbon fiber content of 30% by weight.
【００２３】このペレットを材料として、スクリュー径
４０mm、スクリュー圧縮比１．６の射出成形機で、１８
０mm×２５０mm×３０mmの大きさ、１mmの厚みを有する
弁当箱状の成形品を得た。なお、その時の成形条件は、
スクリュー回転数６０rpm 、シリンダー温度３５０℃、
射出速度９０mm/sec、射出圧力（樹脂圧力）２，０００
kgf/mm2 、背圧２kgf/mm2 、金型温度１００℃であっ
た。この成形品において、１０cm離れた２点間の抵抗値
は８Ω、曲げ強度、曲げ弾性率はそれぞれ１８kgf/mm
2 、２，１００kgf/mm2 であり、また重量平均繊維長は
０．６mmであった。 実施例２ 炭素繊維（引張強度３６０kgf／mm2 、引張弾性率２
３，５００kgf／mm2 、単糸数１２，０００本）に、Ｐ
ＰＳを押出被覆後、長さ７mmにカットして、炭素繊維の
含有率が３０重量％のペレットを得た。Using this pellet as a material, an injection molding machine having a screw diameter of 40 mm and a screw compression ratio of 1.6
A bento box-shaped molded product having a size of 0 mm × 250 mm × 30 mm and a thickness of 1 mm was obtained. The molding conditions at that time are
Screw rotation speed 60 rpm, cylinder temperature 350 ℃,
Injection speed 90mm / sec, injection pressure (resin pressure) 2,000
kgf / mm 2 , back pressure was 2 kgf / mm 2 , and mold temperature was 100 ° C. In this molded product, the resistance value between two points 10 cm apart is 8Ω, and the bending strength and bending elastic modulus are 18 kgf / mm.
2 , 2,100 kgf / mm 2 , and the weight average fiber length was 0.6 mm. Example 2 Carbon fiber (tensile strength 360 kgf / mm 2 , tensile elastic modulus 2
3,500 kgf / mm 2 , single yarn count 12,000), P
After PS was extrusion-coated, it was cut into a length of 7 mm to obtain pellets having a carbon fiber content of 30% by weight.
【００２４】このペレットを材料として、スクリュー圧
縮比が２．２である以外は、実施例１と同条件で成形し
た。実施例１と同様に抵抗値、曲げ強度、曲げ弾性率を
測定したところ、それぞれ６Ω、１６kgf/mm2 、１，５
００kgf/mm2 であり、また重量平均繊維長は０．５mmで
あった。This pellet was used as a material and molded under the same conditions as in Example 1 except that the screw compression ratio was 2.2. When the resistance value, bending strength and bending elastic modulus were measured in the same manner as in Example 1, it was 6Ω, 16 kgf / mm 2 , 1, 5 respectively.
It was 00 kgf / mm 2 and the weight average fiber length was 0.5 mm.
【００２５】比較例１ スクリュー圧縮比が２．２である以外は、実施例１と同
材料、同条件で成形した。実施例１と同様に抵抗値、曲
げ強度、曲げ弾性率を測定したところ、それぞれ２５
Ω、１４kgf/mm2 、１，１００kgf/mm2 であり、また重
量平均繊維長は０．２５mmであった。Comparative Example 1 The same material and conditions as in Example 1 were used except that the screw compression ratio was 2.2. When the resistance value, bending strength, and bending elastic modulus were measured in the same manner as in Example 1, it was 25
Ω, 14kgf / mm 2, a 1,100kgf / mm 2, a weight average fiber length was 0.25 mm.
【００２６】[0026]
【発明の効果】この発明のＣＦＲＴＰ成形品は、重量平
均繊維長が０．３mm以上ある炭素繊維で強化された熱可
塑性樹脂からなるものであるから、たとえ薄肉でも強度
や剛性に優れ、かつ、電磁シールド特性に優れている。Since the CFRTP molded product of the present invention is made of a thermoplastic resin reinforced with carbon fibers having a weight average fiber length of 0.3 mm or more, it has excellent strength and rigidity even if it is thin, and Excellent electromagnetic shielding characteristics.
【００２７】また、そのようなＣＦＲＴＰ成形品を射出
成形により成形するから、成形サイクルを短くでき、製
造コストを下げることができる。Further, since such a CFRTP molded product is molded by injection molding, the molding cycle can be shortened and the manufacturing cost can be reduced.
【図１】本発明に係る射出成形機スクリュー部の横面図
である。FIG. 1 is a lateral view of a screw portion of an injection molding machine according to the present invention.
【図２】本発明の一実施態様に係るＣＦＲＴＰ成形品の
概略斜視図である。FIG. 2 is a schematic perspective view of a CFRTP molded product according to an embodiment of the present invention.
１ スクリュー ２ ペレット ３ ホッパー ４ シリンダ ５ 成形品板状部（格子状斜線部） ６ 開口部 ７ ボルト 1 Screw 2 Pellet 3 Hopper 4 Cylinder 5 Molded Plate (Lattice-like diagonal line) 6 Opening 7 Bolt
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｋ 307:04 Ｂ２９Ｌ 31:34 Ｃ０８Ｌ 81:04 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI Technical display location B29K 307: 04 B29L 31:34 C08L 81:04
Claims (9)
mm以上の炭素繊維とを繊維含有率が２０〜６０重量％に
なるように複合してなる、板状部を有する成形品であっ
て、板状部は、厚みが０．５〜２．０mmの範囲にあり、
かつ、電気抵抗が２Ω／cm以下であることを特徴とする
炭素繊維強化熱可塑性樹脂成形品。1. A thermoplastic resin and a weight average fiber length of 0.3.
A molded article having a plate-shaped portion, which is formed by combining carbon fibers of mm or more with a fiber content of 20 to 60% by weight, and the plate-shaped portion has a thickness of 0.5 to 2.0 mm. Is in the range of
Also, a carbon fiber reinforced thermoplastic resin molded product characterized by having an electric resistance of 2 Ω / cm or less.
曲げ弾性率が１，２００kgf/mm2 以上であることを特徴
とする請求項１記載の炭素繊維強化熱可塑性樹脂成形
品。2. The bending strength of the plate portion is 15 kgf / mm 2 or more,
The carbon fiber reinforced thermoplastic resin molded article according to claim 1, which has a flexural modulus of 1,200 kgf / mm 2 or more.
であることを特徴とする請求項１または２に記載の炭素
繊維強化熱可塑性樹脂成形品。3. The carbon fiber reinforced thermoplastic resin molded article according to claim 1, wherein the thermoplastic resin is polyphenylene sulfide.
上で、引張り弾性率１５，０００kgf/mm2 以上である高
強度、高弾性率炭素繊維からなることを特徴とする請求
項１〜３のいずれかに記載の炭素繊維強化熱可塑性樹脂
成形品。In wherein carbon fibers, tensile strength 200 kgf / mm 2 or more, high strength, which is a tensile elastic modulus 15,000kgf / mm 2 or more, claims 1 to 3, characterized in that it consists of high modulus carbon fiber 5. A carbon fiber reinforced thermoplastic resin molded article according to any one of 1.
が、電子・電気機器用筐体であることを特徴とする炭素
繊維強化熱可塑性樹脂成形品。5. A carbon fiber reinforced thermoplastic resin molded product, wherein the molded product according to any one of claims 1 to 4 is a housing for electronic / electrical equipment.
ンの筐体、キーボード支持体、携帯用電話機筐体、ヘツ
ドフォンステレオキャビネット、またはラジカセキャビ
ネットから選ばれてなることを特徴とする請求項５記載
の炭素繊維強化熱可塑性樹脂成形品。6. The electronic / electrical device enclosure is selected from a notebook personal computer enclosure, a keyboard support, a portable telephone enclosure, a headphone stereo cabinet, or a radio-cassette cabinet. Item 5. A carbon fiber reinforced thermoplastic resin molded article according to item 5.
にある炭素繊維とを、繊維含有率が２０〜６０重量％に
なるように複合してなるペレットを用い、このペレット
を圧縮比が１．２〜１．９の範囲にある射出成形機を用
いて溶融、混練しながら、所望の形状をしたキャビティ
を有する金型に射出成形することを特徴とする炭素繊維
強化熱可塑性樹脂成形品の製造方法。7. A pellet obtained by compounding a thermoplastic resin and a carbon fiber having a length in the range of 2 to 20 mm so that the fiber content is 20 to 60% by weight, and compressing the pellet. A carbon fiber reinforced thermoplastic resin characterized by being injection-molded into a mold having a cavity having a desired shape while melting and kneading using an injection molding machine having a ratio in the range of 1.2 to 1.9. Molded article manufacturing method.
に、重量比率がその炭素繊維の０．６〜４倍の範囲にな
るように熱可塑性樹脂を被覆したペレットを用い、その
ペレットを射出成形機で溶融、混練しながら、所望の形
状をしたキャビティを有する金型に射出成形することを
特徴とする炭素繊維強化熱可塑性樹脂成形品の製造方
法。8. A pellet in which a carbon fiber bundle having a length in the range of 2 to 20 mm is coated with a thermoplastic resin such that the weight ratio thereof is in the range of 0.6 to 4 times that of the carbon fiber is used. A method for producing a carbon fiber reinforced thermoplastic resin molded article, which comprises subjecting pellets to injection molding into a mold having a cavity having a desired shape while melting and kneading the pellets with an injection molding machine.
に、重量比率がその炭素繊維の０．６〜４倍の範囲にな
るように熱可塑性樹脂を被覆したペレットを用い、その
ペレットを圧縮比が１．２〜１．９の範囲にある射出成
形機を用いて溶融、混練しながら、所望の形状をしたキ
ャビティを有する金型に射出成形することを特徴とする
炭素繊維強化熱可塑性樹脂成形品の製造方法。9. Pellets coated with a thermoplastic resin in a carbon fiber bundle having a length in the range of 2 to 20 mm in a weight ratio of 0.6 to 4 times that of the carbon fiber are used. Carbon fiber reinforced, characterized in that the pellets are injection-molded into a mold having a cavity having a desired shape while melting and kneading the pellets using an injection molding machine having a compression ratio of 1.2 to 1.9. Method for producing thermoplastic resin molded product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13512295A JPH08325385A (en) | 1995-06-01 | 1995-06-01 | Carbon-fiber reinforced thermoplastic resin molding and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13512295A JPH08325385A (en) | 1995-06-01 | 1995-06-01 | Carbon-fiber reinforced thermoplastic resin molding and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08325385A true JPH08325385A (en) | 1996-12-10 |
Family
ID=15144344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13512295A Pending JPH08325385A (en) | 1995-06-01 | 1995-06-01 | Carbon-fiber reinforced thermoplastic resin molding and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08325385A (en) |
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| WO2000003859A1 (en) * | 1998-07-16 | 2000-01-27 | Idemitsu Petrochemical Co., Ltd. | Lightweight resin molded product and production method thereof |
| EP0933185A3 (en) * | 1998-01-29 | 2000-02-09 | remaplan Anlagenbau GmbH | Method and apparatus for injection compression moulding of fibre reinforced plastics |
| JP2001113579A (en) * | 1999-10-20 | 2001-04-24 | Polyplastics Co | Method for injection molding polyarylene sulfide resin, and injection molding |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0933185A3 (en) * | 1998-01-29 | 2000-02-09 | remaplan Anlagenbau GmbH | Method and apparatus for injection compression moulding of fibre reinforced plastics |
| WO2000003859A1 (en) * | 1998-07-16 | 2000-01-27 | Idemitsu Petrochemical Co., Ltd. | Lightweight resin molded product and production method thereof |
| US6623838B1 (en) | 1998-07-16 | 2003-09-23 | Idemitsu Petrochemical Co., Ltd. | Lightweight resin molded product and production method thereof |
| JP2001113579A (en) * | 1999-10-20 | 2001-04-24 | Polyplastics Co | Method for injection molding polyarylene sulfide resin, and injection molding |
| JP2009292115A (en) * | 2008-06-09 | 2009-12-17 | Yazaki Corp | Resin molding machine |
| GB2511683A (en) * | 2010-09-07 | 2014-09-10 | Caged Idea S Llc | Data transmission blocking holder |
| US10405622B2 (en) | 2010-09-07 | 2019-09-10 | Caged Idea's Llc | Data signal blocking personal communication device holder |
| US9655419B2 (en) | 2010-09-07 | 2017-05-23 | Michael J. Nash | Data signal blocking personal communication device holder |
| JP2012099745A (en) * | 2010-11-05 | 2012-05-24 | Daicel Polymer Ltd | Molding for preventing leakage and electric shock |
| WO2015064482A1 (en) | 2013-10-29 | 2015-05-07 | 東レ株式会社 | Molded article and molding material |
| CN105683262A (en) * | 2013-10-29 | 2016-06-15 | 东丽株式会社 | Molded article and molding material |
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| US9902840B2 (en) | 2013-10-29 | 2018-02-27 | Toray Industries, Inc. | Molded article and molding material |
| TWI628206B (en) * | 2013-10-29 | 2018-07-01 | 東麗股份有限公司 | Molded articles and forming materials |
| JP2015120358A (en) * | 2015-03-31 | 2015-07-02 | ダイセルポリマー株式会社 | Method of manufacturing heat-conductive injection-molded body |
| JP2018014453A (en) * | 2016-07-22 | 2018-01-25 | 東ソー株式会社 | Lid material for electromagnetic wave shield, and method for manufacturing the same |
| WO2022153589A1 (en) * | 2021-01-15 | 2022-07-21 | 株式会社日本製鋼所 | Injection molding device and injection molding method |
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